Don't generate unneeded monaco.d.ts.txt.

build/release.ts

@@ -323,7 +323,6 @@ function releaseDTS() {
 
 	writeFiles([monacodts, editorapidts], `release`);
 
-	fs.writeFileSync('website/playground/monaco.d.ts.txt', contents);
 	// fs.writeFileSync('website/typedoc/monaco.d.ts', contents);
 }